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Recent 2009 flu pandemic is a global outbreak of a new strain of influenza A virus subtype H1N1. The H1N1 virus has crossed species barrier to human and apparently acquired the capability to transmit this disease from human to human. The NP is a multifunctional protein that not only encapsidates viral RNA (vRNA), but also forms homo-oligomer and thereby maintains RNP structure. It is also thought to be the key adaptor for virus and host cell interaction. Thus, it is one of the factor that play a key role in the pathogenesis of influenza A virus infection. Therefore, to understand the cause of pathogenicity of H1N1 virus, we have studied the structure-function relationship of different domains of NP. Our results showed that conservative mutation in NP of various strains were pathogenic in nature. However, non-conservative mutation slightly abrogated oligomerization and was therefore less pathogenic. Our results also suggest that beside tail and body domain, head domain may also participate in an oligomerization process.

Structure function studies on different structural domains of nucleoprotein of H1N1 subtype